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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
// <optional>
// constexpr const T& optional<T>::value() const &;
#include <optional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
using std::optional;
using std::in_place_t;
using std::in_place;
using std::bad_optional_access;
struct X
{
X() = default;
X(const X&) = delete;
constexpr int test() const & {return 3;}
int test() & {return 4;}
constexpr int test() const && {return 5;}
int test() && {return 6;}
};
int main(int, char**)
{
{
const optional<X> opt; ((void)opt);
ASSERT_NOT_NOEXCEPT(opt.value());
ASSERT_SAME_TYPE(decltype(opt.value()), X const&);
}
{
constexpr optional<X> opt(in_place);
static_assert(opt.value().test() == 3, "");
}
{
const optional<X> opt(in_place);
assert(opt.value().test() == 3);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
const optional<X> opt;
try
{
(void)opt.value();
assert(false);
}
catch (const bad_optional_access&)
{
}
}
#endif
return 0;
}
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